[U-Boot] [PATCH] i2c: mxc: add CONFIG_CLK support

[Peng Fan]

Hi Lukasz,

> Subject: Re: [PATCH] i2c: mxc: add CONFIG_CLK support
> 
> On Tue, 6 Aug 2019 10:09:12 +0000
> Peng Fan <peng.fan at nxp.com> wrote:
> 
> > When CONFIG_CLK enabled, use CLK UCLASS for clk related settings.
> >
> > Signed-off-by: Peng Fan <peng.fan at nxp.com>
> > ---
> >  arch/arm/include/asm/mach-imx/mxc_i2c.h |  6 ++++++
> >  drivers/i2c/mxc_i2c.c                   | 17 +++++++++++++++++
> >  2 files changed, 23 insertions(+)
> >
> > diff --git a/arch/arm/include/asm/mach-imx/mxc_i2c.h
> > b/arch/arm/include/asm/mach-imx/mxc_i2c.h index
> > 8e1ea9af19..81fd981444 100644 ---
> > a/arch/arm/include/asm/mach-imx/mxc_i2c.h +++
> > b/arch/arm/include/asm/mach-imx/mxc_i2c.h @@ -6,6 +6,9 @@
> #define
> > __ASM_ARCH_MXC_MXC_I2C_H__  #include <asm-generic/gpio.h>
> #include
> > <asm/mach-imx/iomux-v3.h>
> > +#if CONFIG_IS_ENABLED(CLK)
> > +#include <clk.h>
> > +#endif
> >
> >  struct i2c_pin_ctrl {
> >  	iomux_v3_cfg_t i2c_mode;
> > @@ -47,6 +50,9 @@ struct mxc_i2c_bus {
> >  	ulong driver_data;
> >  	int speed;
> >  	struct i2c_pads_info *pads_info;
> > +#if CONFIG_IS_ENABLED(CLK)
> > +	struct clk per_clk;
> > +#endif
> >  #ifndef CONFIG_DM_I2C
> >  	int (*idle_bus_fn)(void *p);
> >  	void *idle_bus_data;
> > diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c index
> > 23119cce65..2e157bca58 100644
> > --- a/drivers/i2c/mxc_i2c.c
> > +++ b/drivers/i2c/mxc_i2c.c
> > @@ -890,9 +890,22 @@ static int mxc_i2c_probe(struct udevice *bus)
> >  	i2c_bus->bus = bus;
> >
> >  	/* Enable clk */
> > +#if CONFIG_IS_ENABLED(CLK)
> > +	ret = clk_get_by_index(bus, 0, &i2c_bus->per_clk);
> > +	if (ret) {
> > +		printf("Failed to get i2c clk\n");
> > +		return ret;
> > +	}
> > +	ret = clk_enable(&i2c_bus->per_clk);
> > +	if (ret) {
> > +		printf("Failed to enable i2c clk\n");
> > +		return ret;
> > +	}
> > +#else
> >  	ret = enable_i2c_clk(1, bus->seq);
> >  	if (ret < 0)
> >  		return ret;
> > +#endif
> >
> >  	/*
> >  	 * See Documentation/devicetree/bindings/i2c/i2c-imx.txt
> > @@ -919,7 +932,11 @@ static int mxc_i2c_probe(struct udevice *bus)
> >  	ret = i2c_idle_bus(i2c_bus);
> >  	if (ret < 0) {
> >  		/* Disable clk */
> > +#if CONFIG_IS_ENABLED(CLK)
> > +		clk_disable(&i2c_bus->per_clk);
> > +#else
> >  		enable_i2c_clk(0, bus->seq);
> > +#endif
> >  		return ret;
> >  	}
> >
> 
> Reviewed-by: Lukasz Majewski <lukma at denx.de>

There is a v2 patch to fix an issue. Please help review there.

Thanks,
Peng.

> 
> 
> Best regards,
> 
> Lukasz Majewski
> 
> --
> 
> DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email:
> lukma at denx.de